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Copper defects inside AlN:Cu nanorods – XANES and LAPW study

A A Guda1, S P Lau2, M A Soldatov1, N Yu Smolentsev1, V L Mazalova1, X H Ji3 and A V Soldatov1

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AlN ferromagnetic nanorods with 5 at.% of copper were studied by using x-ray absorption spectroscopy (XAFS) above the Cu K- and L3- edges. Theoretical simulations of XAFS spectra clearly identify a formation of small copper clusters inside AlN lattice. Average size of clusters was estimated to be 50–70 atoms from the analysis of both XANES (X-ray Absorption Near Edge Spectroscopy) and EXAFS (Extended X-ray Absorption Fine Structure) regions of spectra. Calculations of magnetic moments for different types of point copper defects in AlN lattice were made.


PACS

78.70.Dm X-ray absorption spectra

75.30.Cr Saturation moments and magnetic susceptibilities

61.72.J- Point defects and defect clusters

75.50.Dd Nonmetallic ferromagnetic materials

75.50.Pp Magnetic semiconductors

Subjects

Condensed matter: electrical, magnetic and optical

Semiconductors

Condensed matter: structural, mechanical & thermal

Dates

Issue 1 (2009)



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